I made two builds, the first one is the 'unsolved' one, meaning that the middle pilars are not visible yet and some other details.
https://drive.google.com/open?id=1IN_lLL2lxqNH-6LgZ5L9ez2gmltRe1BD
The second build is the 'solved' one, here you can see everything the way it is when the treasure room is open.
https://drive.google.com/open?id=1wkqocedHl5RfbNPwMK4sK2uq58Kw1gpp
Atmosphere before feedback
Atmosphere after feedback
For future iterations and to make this scene fully working and game-ready, I'd want to do a couple of things:
Make the puzzles working with code
Add background music (like the gameplay video)
When the player first enters the scene and when the treasure room opens: Music has to reflect the fact they are entering some special area
Add rumbling noises when the pilars come up and when the treasure room goes down
A game overlay when the player collected all mirror shards and wants to puzzle them together
Sound effect of clinking mirror shards when the player is making the puzzle
When Lara enters the scene for the first time, she could say something like "this looks ancient"
When viewing the treasure room door, Lara could say "That looks like the locked treasure room of Ezcanya"
Other fitting Lara dialogue